Theft of software and other intellectual property has become one of the most visible problems in computing today. This paper details the development and empirical validation of a model of software piracy by individuals in the workplace. The model was developed from the results of prior research into software piracy, and the reference disciplines of the theory of planned behavior, expected utility theory, and deterrence theory. A survey of 201 respondents was used to test the model. The results indicate that individual attitudes, subjective norms, and perceived behavioral control are significant precursors to the intention to illegally copy software. In addition, punishment severity, punishment certainty, and software cost have direct effects on the individual's attitude toward software piracy, whereas punishment certainty has a significant effect on perceived behavioral control. Consequently, strategies to reduce software piracy should focus on these factors. The results add to a growing stream of information systems research into illegal software copying behavior and have significant implications for organizations and industry groups aiming to reduce software piracy.